1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
int main(int argc, char *argv[])
{
int myrank, size, src = 0, dest = 1;
int buf[20];
MPI_Init(0, 0);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
if (myrank == src || myrank == dest) {
int partner = src;
if (myrank == partner)
partner = dest;
MPI_Sendrecv(MPI_BOTTOM, 0, MPI_INT, partner, 0,
MPI_BOTTOM, 0, MPI_INT, partner, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
}
if (myrank == src) {
MPI_Send(buf, 20, MPI_INT, dest, 0, MPI_COMM_WORLD);
} else if (myrank == dest) {
MPI_Recv(buf, 20, MPI_INT, src, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
}
MPI_Finalize();
return 0;
}
|
